From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jim Paris Subject: Re: possible bug: VM drops incoming network packets (tap) Date: Sat, 20 Oct 2007 02:59:08 -0400 Message-ID: <20071020065908.GA17990@jim.sh> References: <6b9952490710192314q10541f44l8b0c9f61d80859c8@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org To: Joris Return-path: Content-Disposition: inline In-Reply-To: <6b9952490710192314q10541f44l8b0c9f61d80859c8-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org Joris wrote: > I have a Debian unstable 64bit host on an intel S3000 quad core xeon > X3210. Kernel 2.6.22-2-amd64 (debian flavour) KVM46. > My guests are debian32 with 1 cpu and 1GB ram, connected via '-net > nic,macaddr=52:54:00:00:00:xx -net tap' and linux bridging. I'm > running 3 guests at the time. > > > Sometimes (see below) the machine appears to drop all incoming packets > from the network. Hi Joris, I'm in the same boat -- upgraded from kvm-36 to kvm-46 and I'm seeing identical network problems. host: quad 64-bit 2.6.20.4 guests: 32-bit 2.6.18, 32-bit 2.6.21, 64-bit 2.6.18 No difference with -no-kvm-irqchip and with "taskset -c 1". I haven't had a chance to debug it much further yet, although trying a different network card might be my next step. I was also (reluctantly) going to try rebooting the host in case unloading the kvm-36 modules left something in a bad state. An especially strange thing is that, before the network dies, sshing from my desktop->host->guest has no problems (gigabit lan from desktop->host). But connecting directly desktop->guest leads to frequent short delays and noticable lag when typing. Since that just seems weird I was going to try to figure that part out before I reported this to the list :) -jim ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/